Once the virtual machine is to install your CD / DVD system installation in the CD / DVD machine (or use iso image as if you specified in Preferences). Then, just turn on your virtual machine by selecting with the mouse and then clicking Run:

Note that you can also run the machine via the context menu available by right clicking or double clicking directly on the virtual machine of choice.

This message simply means that you have not told your virtual machine where to find its operating system. A real system would produce the same error here. Make sure that you have installed an operating system on the hard drive or connected a bootable CD or CD image and told the virtual machine about it.

The message indicate that you have not told your virtual machine where to find its operating system.you will get a same error on a real system . You have installed an operating system on the hard drive or connected a bootable CD or CD image and told the virtual machine about it.